to start off i recently purchased a used 2000 toyota celica. the chassis had 132,700 miles - (136,000 now) and the aftermarket replaced VVT-I engine had about 50,000 miles. the car is a gt however the new engine is the gts 180 hp 1.8 l model. the engine was replaced due to the previous owner seizeing it by not doing regular oil changes, but after the installation of the new motor he claimed the oil was changed on time after such a hefty
expense.

the car ran perfect at first. it vibrated alot idling, however i was told this was only because if the cars very tight suspension.

as time passed i noticed the car began to shake slightly more . almost violently on some occasions. when i took it for an oil change they told me i needed a new belt. got it replaced.

i began to notice my rpms shuddered when first turning on the car. not at all as steady as my moms 2000 camry. also it felt like the pistons were firing off kilter, they werent rhythmic. to help this i decided to start using premium 91 octane gas (yes this is the reccomended fuel type). i had a quarter tank left of regular which was what i was using, said screw it, and told the gas attendant to throw in $20 premium. i pulled out, everything smooth as butter, and then 10 mins later on my way to the freeway to make a 2 hour round trip, i got to a red light and my rpms began fluctuating rapidly like ive never seen. they went from 1400 to 300 in the matter of seconds. back and forth. the car felt slightly more slugglish but not to bad. i stopped turned off the car and drove off again. it seemed fine so i headed on the turn pike. on my way back when i first turned on the car, it idled at 500 rpm but was fine on the turn pike. when i was in my neighborhood on the way back from the turnpike, the CEL turned on.

ever since then the car idles at 1000 to 200. it starts shaking alot.(i filled the tank with premium again. it doesnt idle as rapidly) when i give it gas it drives fine. in park they rpms usually dont sink that low. id say 500 the most. its automatic obviously. the OBD gave a P0420 code. i was thinking the engine damage from the previous owner caused the cat converter to overhead and melt the compounds inside it as a result of the engine seize, but my dad thinks its a bad batch of gas.

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to start off i recently purchased a used 2000 toyota celica. the chassis had 132,700 miles - (136,000 now) and the aftermarket replaced VVT-I engine had about 50,000 miles. the car is a gt however the new engine is the gts 180 hp 1.8 l model. the engine was replaced due to the previous owner seizeing it by not doing regular oil changes, but after the installation of the new motor he claimed the oil was changed on time after such a hefty
expense.

the car ran perfect at first. it vibrated alot idling, however i was told this was only because if the cars very tight suspension.

as time passed i noticed the car began to shake slightly more . almost violently on some occasions. when i took it for an oil change they told me i needed a new belt. got it replaced.

i began to notice my rpms shuddered when first turning on the car. not at all as steady as my moms 2000 camry. also it felt like the pistons were firing off kilter, they werent rhythmic. to help this i decided to start using premium 91 octane gas (yes this is the reccomended fuel type). i had a quarter tank left of regular which was what i was using, said screw it, and told the gas attendant to throw in $20 premium. i pulled out, everything smooth as butter, and then 10 mins later on my way to the freeway to make a 2 hour round trip, i got to a red light and my rpms began fluctuating rapidly like ive never seen. they went from 1400 to 300 in the matter of seconds. back and forth. the car felt slightly more slugglish but not to bad. i stopped turned off the car and drove off again. it seemed fine so i headed on the turn pike. on my way back when i first turned on the car, it idled at 500 rpm but was fine on the turn pike. when i was in my neighborhood on the way back from the turnpike, the CEL turned on.

ever since then the car idles at 1000 to 200. it starts shaking alot.(i filled the tank with premium again. it doesnt idle as rapidly) when i give it gas it drives fine. in park they rpms usually dont sink that low. id say 500 the most. its automatic obviously. the OBD gave a P0420 code. i was thinking the engine damage from the previous owner caused the cat converter to overhead and melt the compounds inside it as a result of the engine seize, but my dad thinks its a bad batch of gas.

i bought it for 5500 i couldnt resist. i love my car besides this issue[/B]

My 01 GT does the same thing when i have the clutch pressed in. But my code is P0441, P0442, and P0443. Yes my car has issues. But thats the code for the evaporative emissions system, and it didnt do that until i had my motor replaced. The guy that did it plugged the EVAP system in backwards and i just dont have any idea where the plugs for it are at. So that might be it?

My 01 GT does the same thing when i have the clutch pressed in. But my code is P0441, P0442, and P0443. Yes my car has issues. But thats the code for the evaporative emissions system, and it didnt do that until i had my motor replaced. The guy that did it plugged the EVAP system in backwards and i just dont have any idea where the plugs for it are at. So that might be it?
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My 02 celica GT has the p0441 from the purge solenoid, i already check the solenoid coming off the intake and it's good so i don't know what to do with mine.

On yours from all the evap codes yes it tells me the lines are all backward i would find a diagram from maybe a Mitchell book, put the lines were they go clear the codes and see what happens